Electrodeposition of Zn-Mg Alloy in Ethylene Glycol-ZnCl_2-MgCl_2 Non-Aqueous Solution

摘要

The electrodeposition of Zn-Mg alloy was investigated in a non-aqueous solution using ethylene glycol (EG) as solvent at 393 K. ZnCl_2 and MgCl_2 were used as Zn and Mg ion sources and could be dissolved in EG. Zn electrodeposits containing a certain amount of Mg were obtained in EG-ZnCl_2-MgCl_2 baths. 8.8 mol% of Mg was coelectrodeposited with Zn in the EG-ZnCl_2-MgCl_2 (85.0-7.5-7.5 mol%) bath at the cathodic current density of 300 Am~(-2), and Mg in this specimen was electrodeposited as Zn-Mg intermetallic compound of Mg_2Zn_(11). The red rust occurrence time of Zn-8.8 mol%Mg alloy plated steel in 5 mass% NaCl aqueous solution at 308 K was about 16.0 times longer than that of Zn plated steel.